; PRINT ENTIRE OF CODE PAGE 437 TO THE SCREEN ; (NASM Source)  _start:     ; Set to 0     xor ax, ax     xor bx, bx     xor cx, cx     xor dx, dx      mov ah, 0x5 ; Select active display page al     mov al, 1     int 0x10      mov bh, 1   ; Page number     mov ah, 0x2 ; Set cursor position to (dl, dh)     int 0x10      xor ax, ax     ; For each character (0-255)     loop:         mov ah, 0xa ; Write character al at cursor position         mov cx, 1   ; Write only once         int 0x10         inc dl      ; x++         ; Create a newline every 32 characters         test dl, 0x1f   ; if dl & 0x1f == 0         jnz nonewline             inc dh      ; y++             xor dl, dl  ; x = 0         nonewline:         mov ah, 0x2 ; Set cursor position to (dl, dh)         int 0x10         inc al      ; al++         test al, al ; if al != 0 goto loop         jnz loop  hang:     jmp hang  ; Count up size of each section %assign text_length ($-$$)  ; Pad the boot sector out to 512 bytes ; All bytes are padded with nop, except the last to (0x55 0xaa). times 510 - text_length nop  db 0x55, 0xaa